Paper-making machine.



C. E. POPE.

PAPER MAKING MACHINE.

APPLICATION FILED M615, 1913.

Patnted Sept- 12, 1916.

' couch roll '1: is spaced from ssess o fiHARLEs ill. PGIE, GI? EGLYQKE, MASSACHUSETTS.

Application filed August To all whom mayconcem Be is known that I, CHeuLEs E. Porn, a citizen of the United States, residing in Holyokc, in the State of Massachusetts, have invented cermin new and useful Improvements in Puper-Mhking Machines, of which the following is a specification.

lhis invention relates to paper making machines and more particularly to means for picking a layer of pulp from the mark ing wire of a paper machine in an improved manner. It finds one of its best adupfiations in connection with a Fourdrinier machine in which, the pulp is formed on a wire which travels continuously in the paper making operation.

The accompanying figure illustrates diagrsmniusically u portion oi a Fourdrinier machine which is directly involved in the application ofiny invention. f

heferring to this figure, the frame rying lh-e Wes end of the machine is designated r and the frame carrying the felts is designated .9. {A portion of the making wire 6 of the machine, is shown us it passes over suction. box c, guide rolls (Z, and between the couch rolls e and f. The layer or sheet of pulp a shown by dotted line is curriedby the wire Z), as shown. The felt ls passes around the upper couch roll"? and meets the layer of pulp held on the wire as the latter posses between the couch rolls. Instead of the making wire passing around the lower has heretofore been the pro 1331313, it passes around a supplemental. guide roll 2, suitably mounted infrunxe .9. Roll is located beyond the couch rolls, thus is, the couch. rolls in the direction of travel arrangement is of particular importance in a high speed machine since all the sharp burns, which must usually be taken by' tne paper web while in a weak condition, are eliminated. Between the couch roll and the supplemental guide roll in I place a we tion box 2, {shown in cross section). The felt is guided by the under surface ofthe suction box travels stun angle away from the wire 5) and meets the lower felt w guided by rolls m in a msnner.-shown in the drawing.- It will benoticed that andiiheshcetof pulp leave the wire, the

Bpeciileefion mi Letters Parent.

countyof Hampden, in the of the making wire. This.

where the f e-ii.

Patented Sept. is, runs.

25, 918. Serial n9. recess;

away from the. wire. This structure and ar-' rungenient permits e suiiicient pressure to act through the wire to transfer the sheet readily to the felt. This, I believe, to be broadly new;

In the ordinary operation of the Fourdrinier machine the making wire together with a sheet of pulp passes bceween couch rolls which press the sheet of pulp before is is transferred to what is called the pick up felt. The wire, according to present practice, passes around the lower of the two couch rolls before beginning its back- Ward' travel, the felt ordinarily passes around the upper couch roll and comes in cont-nus with the sheet of pulp on the wire, causing the said sheet to be picked off by the felmznd carried away from the wire. In manufacturing some papers, there is considerable diliiculty in getting .the sheet of pulp away from the wire and on to'fihe surface of the felt. in analyzing the .diiliculties involved, I have found that the fiber forming the pulp sheet, meshes of the making wire and extends from the underside thereof, so that when the wire passes around the lower couch roll these downwardly hanging ends of-the fibers ere clenched and held to the wire. Vfhen the felt tends to pick the layer of pulp away from the making wire these fibers, being clenched to the wire and held'clenched by i the surface of the lower couch roll, tend to 'prevcni the desiredtransfer. For a long time paper makers culty exists, but}, therehus nos, as far as I know been an adequate explanation of the dilliculty as I have explained iii. If the paper being made is heavy enough it will have su-ilicient strength to be pulled away from the wire in spite of the clenched fibers.

passes through. the small,

have known that the difiithe other hand if 1t 1s light enough the But between these two conditions there P are many weight papers desired where the clenched fibers are strong enough to prevent the proper transfer of the sheet of pulp from the wire at a point where the latter is in contact with the roll. In order to obviate this diiiiculty ithas been customary in the past to groove the lower couch roll or to perforate this roll. By this means there is a smaller area er the Wire in actual contact with the couch roll, than if the latter were not grooved or perforated. This results in the picking the Duper oil the Wire be cause of the decreased holding area of the clenched fibers as the wire passes around the grooved roll. There are many disadvantages in either grooving the roll or perforating it besides the expense involved. For example, it is well. known that the two couch rolls are pressed [toward one another with considerable and this pressure on the making wire which passes between the rolls, arises the wire to be pushed into the grooves or perforations, thus shortening its life, By the use of my invention the life of the wire is much longer than has heretofore been the case.

I provide means for picking the sheet of pulp at e point Where the underside of the Wire is not in contact with any roll, either grooved or perforated, but on the contrary is exposed, sothat as the layer of pulp leaves the wire the ends of the fibers which are ordinarily held'clcnched by the roll, are free to be. pulled, through the meshes of the wire with a small iunoiint of force. The suction box if acting on a given area of the sheet through the felt will make the desired transfer to the felt without the possibility of damage. It will thus be seen that by my invention th roll, instead of being grooved or perforated can be smooth and that the pulp layer will improved manner,

It will be understood that the machine llustrated in the drawings is intended to illust 'il ifi av portion of the Fourdrlnicr ma- 1 chine with the parts operating as usual, except for improved adaptations of the ma chine as specifically described I realize that many different adaptations of my invention might be mode to the Fourdrinier and other machines and I have, therefore, illustrated and described the specific adaptation for illustrative purposes only.

What I claim is I 1. A papermuking machine having in combination a movable making wire, couch rolls between which the wire and pulp sheet thereon puss together with means 10- outed beyond the couch rolls for guiding the wire, a feltar'rangcd to pick the pulp sheet from the Wire between the couch. rolls and the guiding means and a stationary suction box above the felt to insure thetrausfer of the pulp sheet to the felt.

be transferred to the felt in an.

memes A paper making machine ha in} combination, a movable makingwire, couch rolls between which the wire sheet thereon pass together with means located beyond the couch rolls for guiding the when felt arranged to'piclr oil the sheet from the wire between the couch rolls and the guiding meansnnd means to create as pneumatic pressure acting through the wire toward the felt whereby the transfer of the pulp sheet to the felt is insured. I

3. A paper making, machine, having in combination, a movable making wire, a felt suitably mounted in the machine, couch rolls between which the wire and the felt pass with the pulp sheet therebctween, means for guiding the wire beyond the couch rolls, and means constructed and arranged to guide the felt and sheet away from the wire between the couch rolls and said guiding means including a device to cause a pneumutic pressure acting through the wire toward the felt as the latter leaves the wire.

4. A paper making machine having in combination, 1L movable melting wire, couch rolls between which the wire and sheet thereon pass, a felt, means for pressing the felt against the sheet onthe wire a point beyond the couch rolls where the underside ol the wire is exposed, and thereafter separating the felt and sheet carried therel'iy from the wire at such a point, said. means including a device for, causing a pneumatic pressure acting through the wire toward the felt.

A paper making machine, having in combination, a movable melting Wire, a felt suitably mounted in the machine, couc rolls between which the wire and felt pass with the pulp sheet therebetween, a guide roll located beyond the couchroll around which the wire travels, means located be tween the couch rolls and the first mentioned guide roll for directing the felt with the sheet thereon away from the Wire including a, device for causing a pneumatic pressure acting through the wire toward the felt.

6. A'puper making machine having in combination, a movable endless making wire, guiding means theretor including at couch roll and a guide roll located beyond the couch roll around which the wire turns from its upper to its lower travel, on upper" device for causing a pneumatic pressure on,

the underside of the wire toward the felt.

7. A paper making machine comprising in combination, a making wire, couch roll's, an

upper felt carried around the upper couch eluding a device for causing a pneumatie r011, means to gmde the mm and felt wxth pressure actlng through the wire toward the the pulp sheet. therehetween beyond the felt at the pomt of se-aratlon.

couch rolls, and means to separate the felt r C ARLES E. PQPE. \vxt'h the pulp sheet ndhenng on the undervVltnessesr side thereof from the wn-e at a pomtwhere FRANKLIN G. NEAL,

the underside of the Tntter is exposed, in; HARRY W. BOWEN. 

